Ground-Source Bridge Deck Deicing Systems Using Energy Foundations
Ground-Source Bridge Deck Deicing Systems Using Energy Foundations
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DOI：
10.1061/9780784413272.261
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发表时间：
2014-02
期刊：
影响因子：
--
通讯作者：
G. Allen Bowers, Jr.;C. Guney Olgun
中科院分区：
文献类型：
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作者：
G. Allen Bowers, Jr.;C. Guney Olgun
桥面的地源加热可以替代使用盐和化学品来除冰桥面。能源基础、地热钻孔、浅沟或引道路堤可用作能量储存介质和热交换路径，以利用地面作为热源。将能源基础与地源热泵耦合可以提供更高的入口流体温度，并实现更有效的桥梁加热，但代价是更大的能源消耗和更高的系统复杂性。将流体从能源基础直接循环到桥面在很大程度上依赖于现场的地面温度。本文概述了工作原理，以及这些是如何与桥面除冰系统的设计参数。进行了一系列的参数分析，以调查桥面加热过程。分析考虑了各种管间距、入口流体温度（即，地面温度）、流速、风速、环境温度和循环管上的混凝土覆盖层的厚度。研究结果可作为设计地源桥面除冰系统的运行条件和能量需求的基准。地面温度作为被动加热桥面板在冬季加热的基准，这项研究强调了其在寒冷环境中的局限性。这可以通过在夏季从桥面收集热量并将收集的热量注入地面以提高地面温度来克服。这些储存的能量可以在冬季需要时回收。与热量收集和地面储存有关的问题是更广泛研究的一部分，不属于本文的范围。
Ground-source heating of bridge decks can be an alternative to the use of salts and chemicals to deice bridge decks. Energy foundations, geothermal boreholes, shallow trenches, or the approach embankment can be utilized as energy storage media and heat exchange pathways to utilize the ground as a heat source. Coupling the energy foundation with a ground-source heat pump can provide higher inlet fluid temperatures and result in more effective bridge heating but at the expense of greater energy consumption and increased system complication. Circulating the fluid directly from the energy foundation to the bridge deck relies heavily on the in situ ground temperatures. This paper outlines the operational principles and how these are related to the design parameters of bridge-deck deicing systems. A series of parametric analyses was performed to investigate the bridge-deck heating process. The analyses considered a variety of tube spacings, inlet fluid temperatures (i.e., ground temperatures), flow rates, wind speeds, ambient temperatures, and thicknesses of concrete cover over the circulation tubes. The results serve as a benchmark to gauge the operational conditions and the energy requirements for designing ground-source bridge deck deicing systems. Ground temperatures serve as a baseline for heating of bridge decks with passive heating in the winter, and this study underlines its limitations at colder environments. This can be overcome by collecting heat from the bridge deck in the summer and injecting the collected heat into the ground to raise the ground temperatures. This stored energy can be reclaimed in the winter when needed. The issues related to heat collection and ground storage are part of a broader study and fall outside the scope of this paper.